O2TOTES Ultra Lightweight Backpack For Inogen One G3 Unit (Patented Design) (black) Lightweight at under 14 ounces

O2TOTES Ultra Lightweight Backpack Fit For Inogen One G3 & OxyGo (Patented Design) (black) Lightweight at under 14 ounces, Backpack Only, Zippered bottom, fits standard and double battery; black

Inogen One G3 Replacement Column Pair - Oxygen Accessories - Two Removable Metal Columns - 1.63 lbs., 17.8 x 3.66 x 3.62 in.

Inogen One G3 Extended (16-Cell) Battery - Portable Replacement Battery - for The One G3-2.3 lb. and 8.75 x 3.0 x 1.98 in.